Danny is the perfect person to start off with and then jump away from.
I agree with the second half of that sentiment
I like to give everyone a fair shot, and when I first saw GR Research on YouTube a few years ago I started watching - it was only about crossover component 'upgrades' at the time, iirc. I was sceptical about super expensive capacitors, but I thought the idea of replacing electrolytics with film caps might have some merit.
I went ahead and did that with a modest pair of speakers I had - using some inexpensive film caps I happened to have -- and I heard a noticeable improvement (where I'm being deliberately careful to say I heard an improvement rather than there was one

). Annoyingly, it only struck me afterwards that it would have made sense to change one speaker first so I could then do direct A/B comparisons.
Anyway, even if my capacitor replacement did really make a difference, there was one factor I'd overlooked. I hadn't simply replaced electrolytic caps with film caps - I'd replaced 30-year-old caps with new caps. So there was no way to decide what might have made a difference.
Then some time later Danny started selling cables, with some silly demonstration of how a speaker cable used as an FM antenna can work as an FM antenna. And then his mains cables... And at that point I was 50/50 on him... many audio folk manage to mix sense with nonsense, so maybe there was still some sense worth listening for?
But the final straw was his recent speaker products, which employ some nonsense from Shunyata Research... and I'll have nothing to do with anybody who pushes BS like that. (And, also, I was rather disappointed that Ron - can't remember his channel - was in on it, as I'd had a pretty high opinion of him after some of the good stuff he'd previously done).
My experience with Paul McGowan at PS Audio was similar. When I first came across him he seemed like a helpful expert. But as he edged more towards subjective claims he couldn't back up with objective evidence, I went off him too. And I completely gave up on him when he pushed something (I can't remember what) that I knew was pure woo-woo. (I was just reminded of him when I watched Amir's YouTube take-down of some phase shift nonsense Paul had been going on about - YT popping up old ones can come in handy sometimes

)
Anyway, that's my long-winded way of saying: Give everyone a listen, but only stick with people who can back up claims with actual science.